FAILED: patch "[PATCH] drm/ttm: Skip swapout if ttm object is not populated" failed to apply to 5.10-stable tree

The patch below does not apply to the 5.10-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 35f819d218035ddfbc71e7cf62a4849231701e58 Mon Sep 17 00:00:00 2001
From: xinhui pan <[email protected]>
Date: Fri, 21 May 2021 16:31:12 +0800
Subject: [PATCH] drm/ttm: Skip swapout if ttm object is not populated
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Swapping a ttm object which has no backend pages makes no sense.

index 510e3e001dab..a1dcf7d55c90 100644
@@ -145,7 +145,7 @@ int ttm_device_swapout(struct ttm_device *bdev, struct ttm_operation_ctx *ctx,
 			list_for_each_entry(bo, &man->lru[j], lru) {
 				uint32_t num_pages;
 
-				if (!bo->ttm ||
+				if (!bo->ttm || !ttm_tt_is_populated(bo->ttm) ||
 				    bo->ttm->page_flags & TTM_PAGE_FLAG_SG ||
 				    bo->ttm->page_flags & TTM_PAGE_FLAG_SWAPPED)
 					continue;